Storing plastics for CNC machining is a critical aspect that directly impacts the quality of the final product. As a supplier in the CNC Plastic Machining industry, I’ve witnessed firsthand how proper storage can prevent a multitude of issues and ensure that the plastics are in optimal condition for machining. CNC Plastic Machining
Understanding the Importance of Proper Plastic Storage
Plastics have unique properties that make them sensitive to various environmental factors. Temperature, humidity, light, and chemical exposure can all have a significant impact on the physical and chemical properties of plastics. For instance, some plastics may absorb moisture from the air, which can lead to dimensional changes and affect the machining process. Others may become brittle or discolored when exposed to sunlight or certain chemicals.
When plastics are not stored correctly, it can result in a range of problems during CNC machining. These include poor surface finish, inaccurate dimensions, and even tool breakage. By taking the time to understand the specific storage requirements of different types of plastics, we can minimize these risks and produce high – quality machined parts.
Factors to Consider When Storing Plastics
Temperature
Temperature control is crucial when storing plastics. Most plastics have a recommended temperature range within which they should be stored. For example, some thermoplastics like ABS (Acrylonitrile Butadiene Styrene) are best stored at a temperature between 20°C and 25°C. If the temperature is too high, the plastic may soften and deform, while a temperature that is too low can make the plastic brittle.
To maintain the appropriate temperature, it’s important to store plastics in a climate – controlled environment. This can be achieved by using a storage facility with a reliable heating and cooling system. In addition, avoid storing plastics near heat sources such as radiators or direct sunlight, as this can cause uneven heating and damage the material.
Humidity
Humidity can also have a significant impact on plastics. Some plastics, such as nylon, are hygroscopic, which means they absorb moisture from the air. When these plastics absorb moisture, they can swell, which can lead to dimensional changes and affect the accuracy of the machined parts.
To control humidity, it’s advisable to store plastics in a dry environment. This can be accomplished by using dehumidifiers in the storage area. Additionally, plastics can be stored in sealed containers with desiccants to absorb any moisture that may be present.
Light
Exposure to light, especially ultraviolet (UV) light, can cause plastics to degrade over time. UV light can break down the chemical bonds in the plastic, leading to discoloration, brittleness, and a reduction in mechanical properties.
To protect plastics from light, it’s best to store them in opaque containers or in a dark storage area. If the plastics need to be stored in a visible area, consider using UV – resistant covers or coatings to minimize the effects of light exposure.
Chemical Exposure
Plastics can be sensitive to certain chemicals. Exposure to solvents, acids, or alkalis can cause the plastic to dissolve, swell, or become brittle. It’s important to store plastics away from any potential sources of chemical contamination.
When handling chemicals in the same facility as plastic storage, ensure that proper ventilation is in place to prevent the fumes from coming into contact with the plastics. Additionally, keep chemicals in sealed containers and separate them from the plastic storage area.
Different Types of Plastics and Their Storage Requirements
Polycarbonate
Polycarbonate is a strong and transparent plastic that is commonly used in CNC machining. It is relatively resistant to temperature changes but can be affected by humidity. To store polycarbonate, it should be kept in a dry environment with a temperature between 15°C and 30°C. It’s also important to protect it from scratches, as this can affect its optical properties.
Acrylic
Acrylic is another popular plastic for CNC machining. It is sensitive to both temperature and humidity. Acrylic should be stored at a temperature between 20°C and 25°C and a relative humidity of around 40 – 50%. It is also important to protect acrylic from scratches and impacts, as it can crack easily.
Nylon
Nylon is a hygroscopic plastic, which means it absorbs moisture from the air. To store nylon, it should be kept in a dry environment with a low humidity level. It’s also advisable to store nylon in sealed containers with desiccants to prevent moisture absorption.
PVC (Polyvinyl Chloride)
PVC is a versatile plastic that is used in a wide range of applications. It is relatively resistant to temperature and humidity but can be affected by certain chemicals. PVC should be stored away from chemicals such as solvents and acids. It can be stored at a temperature between 10°C and 30°C.
Storage Methods for Plastics
Shelving
Using shelving is a common and effective way to store plastics. Shelves should be made of a material that is compatible with the plastics, such as metal or plastic. The shelves should be clean and free of any debris or contaminants.
When storing plastics on shelves, it’s important to arrange them in an organized manner. Group plastics by type and size to make it easier to locate and access them. Additionally, ensure that the shelves are not overloaded, as this can cause the plastics to deform.
Racks
Racks can be used to store long or large plastic sheets or rods. Racks should be designed to support the weight of the plastics without causing them to bend or deform. They should also be spaced apart to allow for proper air circulation.
Containers
Containers are a great way to store smaller plastic parts or granules. Containers should be made of a material that is compatible with the plastics and should be sealed to prevent moisture and dust from entering. Label the containers clearly to indicate the type of plastic and any other relevant information.
Quality Control in Plastic Storage
Regular quality control checks are essential to ensure that the plastics are being stored correctly. This includes inspecting the plastics for any signs of damage, such as cracks, discoloration, or deformation. It’s also important to monitor the temperature and humidity levels in the storage area to ensure that they are within the recommended range.
If any issues are detected during the quality control checks, appropriate action should be taken immediately. This may include adjusting the storage conditions, replacing damaged plastics, or taking steps to prevent further damage.
Conclusion
Proper storage of plastics is essential for successful CNC machining. By understanding the specific storage requirements of different types of plastics and implementing appropriate storage methods, we can ensure that the plastics are in optimal condition for machining. This not only improves the quality of the final product but also reduces the risk of machining errors and tool damage.
CNC Metal Machining If you are in need of high – quality CNC plastic machining services, we are here to help. Our team of experts has extensive experience in handling and machining a wide range of plastics. We take great care in storing our plastics to ensure that they are ready for the machining process. Contact us to discuss your specific requirements and let’s work together to create the perfect plastic parts for your project.
References
- "Plastics Technology Handbook" by Myers, John A.
- "Handbook of Plastic Materials and Technology" by O. Olabisi
Shenzhen Bishen Precision Technology Co., Ltd.
As one of the leading CNC plastic machining manufacturers and suppliers in China, we warmly welcome you to buy CNC plastic machining for sale here from our factory. All customized products are with high quality and competitive price. Contact us for quotation and free sample.
Address: No.22, Jiaoping Road, Tangxia Town, Dongguan City, Guangdong, China
E-mail: bruce_qin@bishenprecision.com
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